Lathe



c. E. REE D Feb. 21,1928.

LATHE ed July 7, 1925 2 Sheets-Sheet l Ev e?! 602":

0 riei 1121 F11 WIIIHIIIII LATHE Original Filed. July 7, 1923 2Sheets-sh 2 17206773071- Z fie ed,

Patented Feb. 21,1928.

UNETED STATES PATENT OFFICE.

LATHE.

Original applicationfiled July 7, 1923,

My invention relates, as to one phase thereof, to mechanism adapted tooperate a driven element in either direct on, at will, and moreespecially to mechanism whereby one driven element may be operated inthe same, or opposite directions, as another element driven from thesame source of power. An example of amachine to which my invention ismore especially applicable, is a last-turning lathe such, as forinstance, of the type comprising a swing-frame on whichthe pattcrn'an'dthe work are rotatably mounted and the frame oscillates by virtue of therotation of the pattern against a pattern the production ofsubstantially accurate right and left lasts, whether graded or not, bythe reversal of rotation of the pattern and the work, the right lastbeing made by rotating the pattern and the work in the same directionand the left/last being made by operating the pattern andwork inopposite directions; the present application being-a division of mypending application for United States Letters Patent, Serial No. 650,19i, filedJuly 7, 1923;

One of my objects is to provide a reversing mechanism, for use moreespecially in connection with a copying lathe, adapted for themanufacture of both right and left lasts from a single pattern, thatlostmotion between the gears will be minimized; and another object is toprovide a reversing mechanism wherein shifting of,

the gears themselves is avoided.

As regards another phase of my invention, it may be stated that inlathes of the type above referred to the blank from which thelast'istobe formed is rotated by means of a dog on the work-driving spindle whichis relatively long and narrow and in the turning of the last, thecutting mechanism, in its final operations, directly opposes theextremity of the dog which protrudes into the end of the work, theterminal end of the turned last, commonly the heel portion there of,being turned down, in the last-forming operation, to a stub-portionwhich is relatively long and narrow, ference between this dog and thecutting mechanism, this stub, in the turned last, at its longestdimension sub should extend stantially lengthwise of that portion of thedog which engages the turned last and midfollower, for

of such construction and to avoid intcr-.

Serial No. 650,194. Divided and thisapplication filed A'pril 23, 1925.Serial No. 25,363.

way between the opposite sides of the stub and substantially paralleltherewith. It is thus necessary that thelathe be so condi tionedbefore-the last turning operation begins that the stub portion referredto on the turned last will extend relative to the last-dog, as stated,whether the last be a right or left one, this conditioning of themachine involving a certain predetermined positioningof'the last-drivingdog relative to the pattern, and also to the pattern-driving dogin thosecases, as is usual, where a dog similar to the shape of thevlast-drlving dog is employed.

In this connection, still another object of I 0 my invention" is toprovide a reversing mech anism in a last-turning lathe, which is soconstruoted that it cannot be manipulated for efiecting rotation of thepattern and work in opposite directions, or in the samedirection,

unless the last-driving dog occupies the predetermined angular positionrelative to the pattern as above referred to, whereby damage to thecutting mechanism and the pro-.

duction of an imperfect last, by engagement of the cutting mechanismwith the dog, is

- avoided.

Referring to the accompanying draw- 1ngs:-

I Figure 1 is a broken face view of theswinging frame portion of acopying lathe for producing last-s in accordance with apatterncomprising mechanism for rotating the pattern and the work,including reversing mechanism embodying my invention. Figure 2 is anenlarged section taken at the line 2-2 on Fig. 1 and viewed'in thedirection of the arrow, this section being taken through the reversingmechanism. Figure 3 is a broken section taken at the irregular line 3-3on 2 and viewed in the direction of the arrows. Figure 4 is a plansection taken at the line 4-& on Fig. 2 and viewed, in the direction ofthe arrows. Figures 5 and 6 are sections taken at the lines 5 and ii onFig. 4:, respectively, and viewed in-the direction of the respectivearrows. Figure 7 is a broken view in elevation of a sectional shaftforming a part of the machine; and Figure 8, a section taken at the lineSon Fig. 7 and viewed in the direction of the arrow.

Inasmuch as I have devised my invention for embodiment in a machine ofthe general construction shown in my pending application above referredto, I have chosen to illustrate it in such a machine, but not, however,with the intention of limiting it to embodiment in'such a construction.

As machines of the general construction showmand above referred to, arecommonly known, it will be sufficient to state that 10 represents aframe which, in accordance with common practice, is 'pivotally supportedat-v its upper end on the frame work of'the machine, toextenddependinglyinto a position in which it opposes the pattern follower andthe last-cutting mechanism mounted on the frame work and commonlyassociated with pantographic grading mechanism for effecting theproduction of lasts of different sizes from a single pattern. The frame10 forms the carrier, or support, for the lastpatternand thelast-bl'ank.both of which are rotatably supported in this frame and are, operated,in accordance with the preferred embodimentof my invention, by thefollowing described mechanism:

The frame 10 is provided with a pattern drivingspindle 11 terminating ina dog 12, its terminal portion, at which it engages the back of the heelportion of the pattern and presents alining teeth 13, being relativelylong and narrow. The fIZiFQG'alSO carries a tail stock 14 presenting aspindle 15 for' engaging the toe portion of the pattern, it

. being understood that the axes of the spindles 11 and 15 are inalineinentand that the pattern is driven by rotating the spindle Theframe 10- atits opposite endis pro- 7 vided with a driving'spindle 16presenting a dog portion 17 with its terminal portion, represented at18, toothed and elongated as explainedof the dog portion 12, andprovided for engaging with, and blank from which the last is to beturned, the other end of this blank being supported on a stationaryspindle 19 forming a portionof the tail stock 20 and also carried by theframe 10. v The drive for the spindles 11 and 16,"in

' theparticular arrangement shown, is through a shaft 21 journaledin algear-case 22 carried by the framelO. Inthe arrangement shown the shaft21 is always driven in the same direction, any suitable means, such asthose shown n my pending application above referred to, being providedfor effecting the drive. The shaft 21 at the end thereof which extendsinto thecasing22 is provided with a spiral gear 23 located in said caseand meshing with a spiral gear 24, also located in this case, andcarried by a sec tional shaft'25 which extends lengthwise of the frame10. The shaft 25 is journaled in a gear case 26 secured to a,cross-piece 27 of the framevlO, this-shaft carrying a spiral gear (notshown) located in the case 26 and driving, the

meshing with a spiral gear (not shown) also located in this case andrigidly connected to the drivingspindle 16. The gear 23, "whichonly'partially overlaps the periphery of the gear 24, meshes with aspiral gear 28 jourdisposed openings and 34 in the sides of V the gears28 and 29,resp'ectively. The parts just described are so proportionedandjarranged that when the clutch-disk 31 which,

it will be understood, rotates with the shaft L 11, is moved either toits extreme position" tothe right or left in Fig, 4 for clutching withthe gear 29 or 28, itis unclutched from the other thereof, thisconstruction permit tingof the driving ofthe shaft 11 from the gears 23and 28 for rotating it in the same direction as the shaft 25, or drivingit from the gears 23,

'24 and 29, to rotate it reversely;

The clutch-tlisk 31 is shown as preferably grooved, as represented at 35tofreceive a roke-shaped shifting device 36 mounted on r rod 37'slidably lengthwise iirtlie' gear-cas- V ingf22v In'the arrangementshown the" gears 28'.

body por and 29 are formed of the main tions 28 and 29, respectively,recessed at their inner faces representedat 28 and 29*, respectively,and rings 38 "and 39, re-

spectively, locatedin the said recess-es and secured in place by setscrews 40 which pass through the portions 28 and 29 and screw intothreaded openings in the rings 38 and 39, the apertures 33 and 34,abovereferred to, being provided in these rings; The openings in the bodyportion 28 and through which the set screws 40,holding the ring 38 inplace, extend, are of elongated" arc-shape as represented in Fig. 5thereby" permitting of relative adjustment between the ring 38, andthebody portion 28 of the 7 gear 28,,for a purpose herein described;

two alining sec- The shaft 25 is formedof tions 25 and 25 'coupledtogether by a cou-- 'pling comprising a's'leevedike portion keyed to theshaft-section'25, as represented at 101, a setscrew 102 securing thesleeve 100 againstmovement relative to this shaftsection. The couplingalso comprises a collar 103 keyed to the shaft section 25 shown at 104.The coupling sections 100 I and 103 are relatively adjustable abouttheir axes, tospermit of the relative adjustment of the shaft-sectionsabout their axes, the means shown comprising the machine, namely,

105 which extend at their threaded ends through arc-shaped slots 106 inthe collar 103 and screw intov openings flanged portion 108 of thesleeve understood from the'foregoing that upon loosening the screws 105the sections of the relatively rotated with the.

collar may be shaft-sections with which they are connected and theseparts be held in relatively adjust-' ed position by tighteningthe screws105.

In connection with the use of machines of the swinging-frame type it hasbeen found in practice, in order that the stub turned on the last extendlengthwise of the portion of the dog holding this end of the last, inthe turning of a reverse last, as for example a left-hand last from a.right-hand pattern and which involves rotation of the spindles 11 and 16in opposite directions, that the dogs for the pattern and blank shouldoccupy a predetermined angular position to the vertical upon positioningthe blank in be tipped backwardly at their upperportions and forwardlyat their lower portions. This angle where the parts of the machine areproportioned and arranged substantially as shown, should beapproximately 7, but will be varied according to the varying of theproportions of certain parts of the machine. To ensure such positioningof the dogs before the turning operation begins, the various parts ofthe machine are adjusted, to such positions that the clutch mechanismfor the gears 28 and 29 cannot be operatively connected with the gear 29unless these dogs occupy such predetermined position.

In the assembling of the parts of the machine the clutch is assembledwith the pins 32 extending into the openings 34 in the disk 39, thisdisk being rigidly secured to the gear 29 by its screws 40. Thespindle'll is then rotated to a position in which the dog 12 inclinesrearwardly 7 as hereinbefore stated. The disk 38 is then rotatablyadjusted on the gear 28 to a position in which the openings 33 in thedisk 38 extend in alineinent with the respective pins 32 of the clutchto receive these pins when the clutch is shifted to.

4L0 then pinned, The and the left in Fig. i and the screws tightened andif desired the disk 38 in adjusted position, to the gear .28. couplingbetween the shaft-sections 25 is then loosened and the shaft-section 25rotated to cause the dog 17 to-incline rearwardly 7 o as hereinbeforestated and the clamping screws 105 then tightened. As

gears 28 and 29 rotate in opposite directions clutch disk 31 can only beshifted when the dogs and gearing are at rest and then only when the doghas been turned approximately 7 with reference to the disk 38 or 39 withwhich it is to be engaged from its working strain position in the samedirecaseries of clamping screws I 107 in the 100, it being' :ing, the

by Letters Patent, 1s:

was at work and the clutch then shifted to,

reverse the rotation;of the dog.

As will beunderstood from the foregoreversing gearing provided for thepurpose of adapting the machine for, the single pattern permits of theturning of either rightv or left requiring the shifting of the gearsthemselves.

inaking of both right and left lasts from a lasts without requiring;that the pattern be disturbed, and without.

I I I Lne gears, which 1s pa I ticularly objectionable in a last-turningmachine for producing both right and left lasts from a single pattern,is eliminated, it being an established fact that in the operation oflathes of this character there is a certain amount of back-lash when thetool strikes the work.

WVhile I have illustrated and described a particular constructionembodying my invention, I do not wishto be understood as intending tolimit it thereto, as the same may be variously modified and alteredWithout departing from the spirit of my' invention.

lVhat I claim asnew, and desire to secure 1. In a last-turning lathe,

volving rotatable pattern andwork support: ing dogs, and means fordriving said dogs tions, at will, comprising intermeshing gears,clutching means cooperating with said gears to drive one of said dogs ineither direction and movable into position for driving saidlast-referred-to dog, only when said dogs extend at a predeterminedangle to the vertical to drive said last-referred-to dog in reversedirection, the one of said gears which. is driven by the clutch to drivesaid last-referred-to dog in reverse direction being formed in sectionsone of which carries the teeth of the gear and the other the portionwhich interlocks with said clutching means, a sectional shaft thesections of which are relatively adjustable angularly about their axes,and means operat-ively connecting said shaft sections together inadjusted position.

2. In a last-turning lathe, the combination of a support, means on saidsupport, involving rotatable pattern and work supporting dogs, and meansfor driving said dogs in the same direction or in opposite directions,at will, comprising intermeshing gears, clutching means cooperating withsaid gears to drive one of said dogs in eitherthe combina- ,tion of asupport, means on said support, in-

loo

in the same direction or in opposite direclast'-referred-to dog inreverse direction, said last-referred-to gear being formed in sec tionsone of Which carries the teeth of the gear and the other the portionWhich. interlocks With said clutching means, a sectional shaft thesections of Which are relatively adjustable angularly about their axesand:

spiral gears, clutching means cooperating drive said last-referred-todog in 1 reverse di? P60131011, said last referred to gear bemg formedin sections one of Which carries the teeth of the gear and the other theportion With said gears to drive one ofsaiddogsin either direction andmovableinto "position. for driving said last-referred-to dog, only in. asingle predetermined angular position of the gear-engaged by saidclutching means towhich interlocks with said clutching means,

a sectional shaft the sections of which arerelatively adjustableangularlyabout their axes and means operatively connectingisaid shaftsections together in adjusted position.

, CHARLES E. REED.

